首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2883610篇
  免费   222795篇
  国内免费   5454篇
耳鼻咽喉   38888篇
儿科学   95169篇
妇产科学   80087篇
基础医学   409877篇
口腔科学   85717篇
临床医学   259302篇
内科学   558073篇
皮肤病学   63709篇
神经病学   228893篇
特种医学   112124篇
外国民族医学   708篇
外科学   437621篇
综合类   70202篇
现状与发展   6篇
一般理论   1015篇
预防医学   220586篇
眼科学   68354篇
药学   214989篇
  9篇
中国医学   6369篇
肿瘤学   160161篇
  2018年   30342篇
  2017年   23371篇
  2016年   25782篇
  2015年   29546篇
  2014年   40994篇
  2013年   61182篇
  2012年   83875篇
  2011年   88483篇
  2010年   52394篇
  2009年   49275篇
  2008年   83229篇
  2007年   88196篇
  2006年   89086篇
  2005年   85833篇
  2004年   83740篇
  2003年   79976篇
  2002年   77619篇
  2001年   140882篇
  2000年   144935篇
  1999年   121322篇
  1998年   32871篇
  1997年   29254篇
  1996年   29203篇
  1995年   28201篇
  1994年   26242篇
  1993年   24411篇
  1992年   96155篇
  1991年   93405篇
  1990年   90540篇
  1989年   87333篇
  1988年   80467篇
  1987年   78882篇
  1986年   74983篇
  1985年   71963篇
  1984年   53327篇
  1983年   45808篇
  1982年   26383篇
  1981年   23603篇
  1979年   49432篇
  1978年   34091篇
  1977年   28979篇
  1976年   27217篇
  1975年   28791篇
  1974年   35126篇
  1973年   33773篇
  1972年   31187篇
  1971年   29259篇
  1970年   27059篇
  1969年   25338篇
  1968年   23338篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
35.
Graefe's Archive for Clinical and Experimental Ophthalmology - The published online version contains mistake as the author's first name and last name have been interchanged as "Hild...  相似文献   
36.
37.
38.
Coronary embolism (CE) is an uncommon and unique cause of acute myocardial infarction. In this report, we review 216 cases of CE including 2 new cases from our institution. The mean patient age was 52.5 years and 62% of the patients were males. Chest pain was the most common presenting symptom followed by dyspnea, and the most commonly affected vessel was the left anterior descending artery. Leading etiologies of the embolus were atrial fibrillation, septic emboli, and iatrogenic causes. Treatment approaches varied with thrombus aspiration being used in 30% of cases. In-hospital mortality rate was 36% and 13% of the cases were complicated by cerebrovascular accident. CE is a unique pathology that leads to acute myocardial infarction. It portends a high mortality rate and requires a high level of suspicion as symptoms may be misleading. Further research is needed in order to improve recognition and management and to lower associated mortality.  相似文献   
39.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
40.
Krishna S. Iyer 《Platelets》2020,31(4):474-482
Abstract

Platelets are small, anucleated effector cells that play an important role in linking the hemostatic and inflammatory processes in the body. Platelet function is known to be altered under various inflammatory conditions including aging. A gain in platelet function during aging can increase the risk of thrombotic events, such as stroke and acute myocardial infarction. Anti-platelet therapy is designed to reduce risk of serious cerebrovascular and cardiovascular events, but the adverse consequences of therapy, such as risk for bleeding increases with aging as well. Age-associated comorbidities such as obesity, diabetes, and hyperlipidemia also contribute to increased platelet activity and thus can enhance the risk of thrombosis. Therefore, identification of unique mechanisms of platelet dysfunction in aging and in age-associated comorbidities is warranted to design novel antiplatelet drugs. This review outlines some of the current areas of research on aging-related mechanisms of platelet hyperactivity and addresses the clinical urgency for designing anti-platelet therapies toward novel molecular targets in the aging population.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号